Son of Mansur, representative of the Christians to the court of the Muslim caliph. Apparently thrived as a Christian in a Saracen land, becoming the chief financial officer for caliph Abdul Malek. Tutored in his youth by a captured Italianmonk named Cosmas. Between the Christianteaching from the monk, and that of the Muslim schools, John became highly educated in the classical fields (geometry, literature, logic, rhetoric, etc.).

He defended the use of icons and images in churches through a series of letters opposing the anti-icon decrees of Germanus, Patriarch of Constantinople. Legend says that Germanus plotted against him, and forged a letter in which John betrayed the caliph; the caliph ordered John’s writing hand chopped off, but the Virgin Mary appeared and re-attached the hand, a miracle which restored the caliph’s faith in him.

Show me the icons that you venerate, that I may be able to understand your faith. - Saint John of Damascus

The saints must be honored as friends of Christ and children and heirs of God, as John the theologian and evangelist says: “But as many as received him, he gave them the power to be made the sons of God….” Let us carefully observe the manner of life of all the apostles, martyrs, ascetics and just men who announced the coming of the Lord. And let us emulate their faith, charity, hope, zeal, life, patience under suffering, and perseverance unto death, so that we may also share their crowns of glory. - Saint John of Damascus, Exposition of the Orthodox Faith

Even though your most holy and blessed soul was separated from your most happy and immaculate body, according to the usual course of nature, and even though it was carried to a proper burial place, nevertheless it did not remain under the dominion of death, nor was it destroyed by corruption. Indeed, just as her virginity remained intact when she gave birth, so her body, even after death, was preserved from decay and transferred to a better and more divine dwelling place. There it is no longer subject to death but abides for all ages. – Saint John Damascene